/*
 * This file is part of the KubeVirt project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright The KubeVirt Authors.
 */

package alerts

import (
	promv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1"
	"k8s.io/apimachinery/pkg/util/intstr"
	"k8s.io/utils/ptr"
)

func virtApiAlerts(namespace string) []promv1.Rule {
	return []promv1.Rule{
		{
			Alert: "VirtAPIDown",
			Expr:  intstr.FromString("kubevirt_virt_api_up == 0"),
			For:   ptr.To(promv1.Duration("10m")),
			Annotations: map[string]string{
				"summary": "All virt-api servers are down.",
			},
			Labels: map[string]string{
				severityAlertLabelKey:        "critical",
				operatorHealthImpactLabelKey: "critical",
			},
		},
		{
			Alert: "LowVirtAPICount",
			Expr:  intstr.FromString("(kubevirt_allocatable_nodes > 1) and (kubevirt_virt_api_up < 2)"),
			For:   ptr.To(promv1.Duration("60m")),
			Annotations: map[string]string{
				"summary": "More than one virt-api should be running if more than one worker nodes exist.",
			},
			Labels: map[string]string{
				severityAlertLabelKey:        "warning",
				operatorHealthImpactLabelKey: "warning",
			},
		},
		{
			Alert: "VirtApiRESTErrorsBurst",
			Expr:  intstr.FromString(getErrorRatio(namespace, "virt-api", "(4|5)[0-9][0-9]", 5) + " >= 0.8"),
			For:   ptr.To(promv1.Duration("5m")),
			Annotations: map[string]string{
				"summary": getRestCallsFailedWarning(80, "virt-api", durationFiveMinutes),
			},
			Labels: map[string]string{
				severityAlertLabelKey:        "critical",
				operatorHealthImpactLabelKey: "critical",
			},
		},
		{
			Alert: "KubeVirtDeprecatedAPIRequested",
			Expr:  intstr.FromString("sum by (resource,group,version) ((round(increase(kubevirt_api_request_deprecated_total{verb!~\"LIST|WATCH\"}[10m])) > 0 and kubevirt_api_request_deprecated_total{verb!~\"LIST|WATCH\"} offset 10m) or (kubevirt_api_request_deprecated_total{verb!~\"LIST|WATCH\"} != 0 unless kubevirt_api_request_deprecated_total{verb!~\"LIST|WATCH\"} offset 10m))"),
			Annotations: map[string]string{
				"description": "Detected requests to the deprecated {{ $labels.resource }}.{{ $labels.group }}/{{ $labels.version }} API.",
				"summary":     "Detected {{ $value }} requests in the last 10 minutes.",
			},
			Labels: map[string]string{
				severityAlertLabelKey:        "info",
				operatorHealthImpactLabelKey: "none",
			},
		},
	}
}
